Gamma gallery is a powerful, stylish, responsive image gallery WordPress plugin which is free and comes with a nice full screen view and various slideshow features like play/pause. The plugin supports native WP features like random order, include/exclude images, rearrange order etc. Simply install and activate it and that’ all, there are no configuration settings to make, it works automatically with default WordPress image gallery feature.
Stock.Xchng is a free online service that provides you with thousands of good, high quality images and graphics which you can freely use in your weblog content, header, background or anywhere you like, you can use them as desktop wallpaper or as an illustration for your blog, you can spice up your commercial website design project etc.
Just like you pass tags in your WordPress blog posts; you can also tag images using a free WordPress plugin called WP Media Tagger. The plugin is extensively configurable and comes packed with a bunch of features enabling WordPress media tagging and search & media taxonomy etc.
Cloudinary.Com has launched a free WordPress plugin that lets you host your WordPress images on cloud using a fast CDN all free of cost. The service automatically uploads, normalize, optimize and back up all your WordPress site images to its cloud and makes you free from messing around with image editors; Cloudinary can manipulate and transform your images online on-the-fly and you can manage everything directly from your WordPress admin area dashboard; resulting images are cached, optimized and delivered using a fast content delivery network (CDN).
The Alpine PhotoTile for Instagram is a free Instagram plugin for WordPress site owners. The pluginis is capable enough of retrieving photos from givn Instagram user and tag. You can link Photos to your Instagram page, any URL or to a Lightbox Slideshow. Using its shortcode generator you can easily insert Instagram widget inside you blog posts and pages. Full demonstration of this plugin is available at The Alpine Press.